fix: avoid exception-based Base64 decoder selection - #2173
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Signed-off-by: Arnab Nandy <arnab_nandy7@yahoo.com>
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Fixes #2159 ☕️
This change avoids using exceptions to select between standard Base64 and Base64url decoders. It normalizes trailing whitespace, detects Base64url-specific characters (- and _), and selects the appropriate decoder directly.
Regression tests cover padded, unpadded, and trailing-whitespace Base64url input.